Ventilating-washer for knife-blade fuses.



l. W. STEELMAN.

VENTILATING WASHER FOR KNIFE BLADE FUSES.

APPLICATION FILED IAN.27. I9I5.

l, 173,889. Patented Feb. 29, 1916.

(jm-vauro@ UNITED sTATEs PATENT oEEIcE.

JOSEPH'W. STEEIMAN,"0F PHILAIELPHIA, PENNSYLVANIA, ASSIGNOB HARRIGAN, OF CAMDEN, NEW JERSEY.

T0 JOHN C.

vENTILATINe-wasnnn Eon Emre-BLADE rusas.

To all whom-it may concern:

"Be it known that I, J osEPH WV. STEELMAN, ya citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Ventilating-Washers for Knife-Blade Fuses', andl do hereby declare the followlng to be .av full, clear, and exact description of the invention, such as' will enable others skilled in the art-to which it appertains to make and use the same, reference being-had to the accompanying drawings, and tothe letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in fuse cartridges and it relates more particularly t0 the provlsion of means for Ventilating any type of fuse which is commonly known as knife-blade fuses.

To this end and to such others as the invention may pertain, the same consists in the novel construction and in the peculiar arrangement, combination and adaptation of parts, all as will be more fully hereinafter described, shown `in the accompanying drawings and then 'specifically defined in the appended claims.-

My inventionfis clearly illustrated in the accompanyinr drawings which. with the numerals of reference marked thereon, form a part of. this specification and in which Figure 1 is a side elevation of a reillable knife-blade fuse cartridge of the' type to which my invention is applied. Fig. 2 is a verticalcentral longitudinal section of the same. Flg 3 1s an end View of the cap removed. Fig. ,4 is a plan view of the inner side or face of the Ventilating washer, and Fig. 5 is a plan view of the fusible connecting strip. i l

Reference now being had to theI details 'of the drawings by numeral, l represents the tubular body portion ofv the cartridge, the same consis ing of a tube composed of suitable insulated material and having the inner surface at its opposite ends iiared outwardly as shown at 2, thel recessed ends being designed to receive a` pair of conical wedge-shaped blocks 3, disposed within the Specification of Letters Patent.'

Application led January 27, 1915.- Berial No. 4,685.

conicall opening provided by the outward Haring recess formed `.for their reception within the ends of the'tube. The oflice of these blocks is to engage betweenthem the en ds of the fusible strip 4, and serve to hold said strip in position. 5, 5 designate openended screw-,threaded caps which are internally threaded to engage the external threads upon the outer ends of the'face of the cartridge. 6 is a metallic disk to the outer face of which is secured the knifeblade extension 7 and the opposite face 8 of the disk, which face, when the disk. is in use, contacts with the end faces of the blocks 3, 3, is provided v' with a circular groove 9 and provided at 'intervals and communicating with the groove are .ventilatingopenings 1Q, 10.

It will be noted that the ends of the fusible strip being retained between the sections 3 of the conical blocks allows a slight space between the blocks and at the ends ofthe strip, whereby' ventilation from the interior of the fuse to the under face ofthe disk 8 is provided. This space, communicating as it does with the circular groove 9 upon the inner face of the disk 6, permits free ventilation through the openings 10, l0.

Hav/ing thus described my invention, what l .claim to be new and desire to secure by Letters Patent is 1 A knife blade fuse cartridge comprising a hollow cylindrical cartridge circumferentially threaded, the inner surface of' which near its ends iiares outwardly, conicalshaped clamping blocks engaging said flaring surfaces, a'fuse clamped by said blocks, slotted caps itted over the threaded portion of said cartridge, metallic disks having blade extensions passing through said slots, said disks being held by the caps against the ends of the conical-shaped blocks, the inner face of each disk having a circumferenti-al groove with vent openings therein.

In testimony whereof I hereunto afiix my signature in presence of two witnesses.

JOSEPH w. sTEELMAN.

. Witnesses:

.G. A. HUBER, W. R. HUMMEL. 

